A term local to Portsmouth that means obviously 'dodgy' or suspicious.
That bloke's weed was mack as f**k, I wouldn't take it for free, let alone pay for it.
by buggeredjabba February 02, 2011

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noun: This common term can sometimes be used to describe a hard-ass individual who is constantly fighting homosexual urges, partly due to the fact that they are around members of the same sex. Some avid enthusiasts have been known to get the word "mack" tattooed somewhere on their upperbody, usually the chest.
Aaron: "Hey Eric. Did you hear about that mack Shane saying how he wanted to kiss Greg and then try to hide it by sneezing eight times in a row?"

Eric: "Eight times in a row?!"
by et87 February 20, 2009

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A male that is very smoothe with his flirting skills and almost always seduces any girl he wants.

-or-

A female that can seduce any man that she wants either by flirting or by not saying anything at all.
Look at that mack, he can get any girl he wants.

Look at her, she's a mack on attack, she spittin game without even saying anything.
by Kay Bizzle June 28, 2007

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To flirt, talk provactively in the interest of getting a member of the opposite sex to like you
"I constantly mack on the hunnies in the mall"
by Sarge- March 22, 2006

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To hit on or seduce fine looking ladies. By any means necessary even if it includes people's lunch!
1. Tom and Eddy macked the two hottest women at the party
by henno May 02, 2005

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a butthole, player who thinks he's the biggest flirt in the world
Gosh, Mack, you are so dang ugly!
by Stephanieni October 19, 2014

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A complete asshole and waste of time. A Mack will play girls, cheat, pretend to love his gf, and be a complete douche to his exes who dont deserve his shit. Everyone knows him as the one to fuck over girls. A mack doesnt mean any of the shit he will say to earn trust and forgiveness. Macks will let you think your in love and knows how to sweet talk, but inside its all a game for him. Macks should be hated by all.
(girl crying)

friend of girl: aww whats wrong?

girl: I just saw my bf making out with that girl over there

next day

girl: oh nevermind bout that, we figured it out, i think were really in love afterall(:
friend: ...what a fucking mack
by calichick15 April 27, 2011

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